__________和__________均属于空间结构。
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四大地圈包含_________ ; __________ ; __________和___________。
Why do you think ______ ?
A. is he right
B. he is right
C. he right
D. right is he
Good afternoon. We would like a private room _____ twenty tomorrow evening.
A. for
B. at
C. on
D. to
I don't know how ____ English well.
A. learn
B. learning
C. to learn
D. learned